Storing Data For Specific Users and Applying That Information.

I am working on a subscribeable feed for my WP site, but I have little knowledge in PHP/storing items in a database.

Here is what I need it to do:

-You register for an account and you are taken to the subscribe to feed page (done)

-On this page you can select between a few options of “feeds” you’d like to subscribe to. Each “feed” is a post category. Need to store this submitted data for later use. This is user specific information.

-When you go to the feed page, it will show all the articles that a specific user has chosen to subscribe to. So I need to hide certain post categories based on the data stored for that specific users feed selection.

The main things I’m lost on are saving data for each specific user and creating the form to do so. I’m very inexperienced in PHP/databases/data storage.

Thanks!